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41.
Generation and propagation of several-day period fluctuations along the southeast coast of Honshu, Japan, were investigated by analyzing sea level data and by using a numerical model. The sea level data obtained at twelve stations from Choshi to Omaezaki in fall in 1991, showed energy peaks at the 3–6 day period at the eastern stations in this coast. Time lags of the 3–6 day period fluctuations between station and station indicate westward propagation along the coast. However, the energy level of the 3–6 day period fluctuations suddenly decreased south of the Izu Peninsula. Numerical experiments using a two-layer model were performed to clarify the generation and propagation mechanism of the several-day period fluctuations by periodical wind in fall. The amplitude distributions of observed sea level were qualitatively explained by a coastal-trapped wave (CTW) in the numerical experiment. From the discussions on propagation of a free wave, CTW with the characteristics of a shelf wave generated by the wind along the northeast of the Boso Peninsula was separated into two types of wave at the southeast of the peninsula. One is an internal Kelvin wave with large interface displacement and the other is the shelf wave propagating over the northern part of the Izu Ridge. The sudden decrease in the surface displacement with the 3–6 day period observed at the western stations is considered to be due to the local effect of the wind and phase relation between the internal Kelvin wave and shelf wave. 相似文献
42.
Ocean Dynamics - Residual mercury dynamic has been the research emphasis since mercury contamination was publicly recognized in Minamata Bay. Simulation of mercury distribution and transport... 相似文献
43.
Tomoharu Senjyu Noriko Asano Masaji Matsuyama Takashi Ishimaru 《Journal of Oceanography》1998,54(1):29-44
Intermediate intrusion of low salinity water (LSW) into Sagami Bay was investigated on the basis of CTD data taken in Sagami
Bay and off the Boso Peninsula in 1993–1994. In October 1993, water of low temperature (<7.0°C), low salinity (<34.20 psu)
and high dissolved oxygen concentration (>3.5 ml I−1) intruded along the isopycnal surface of {ie29-1} at depths of 320–500 m from the Oshima East Channel to the center of the
bay. On the other hand, the LSW was absent in Sagami Bay in the period of September–November 1994, though it was always found
to the south off the Boso Peninsula. Salinity and dissolved oxygen distributions on relevant isopycnal surfaces and water
characteristics of LSW cores revealed that the LSW intruded from the south off the Boso Peninsula to Sagami Bay through the
Oshima East Channel. The LSW cores were distributed on the continental slope along 500–1000 m isobaths and its onshore-offshore
scales were two to three times the internal deformation radius. Initial phosphate concentrations in the LSW revealed its origin
in the northern seas. These facts suggest that the observed LSW is the submerged Oyashio Water and it flows southwestward
along the continental slope as a density current in the rotating fluid. The variation of the LSW near the center of Sagami
Bay is closely related to the Kuroshio flow path. The duration of LSW in Sagami Bay is 0.5 to 1.5 months. 相似文献
44.
Midori Kawabe Hiroshi Kohno Takashi IshimaruOsamu Baba Naho HorimotoReiko Ikeda Jota KandaTakafumi Kudo Masaji MatsuyamaMasato Moteki Yayoi OshimaTsuyoshi Sasaki 《Marine Policy》2009
This paper reviews the initial phase of a coastal education for sustainable development program for Edomae, the innermost reaches of Tokyo Bay. The program has been steered by a working group of Tokyo University of Marine Science and Technology faculty members from different academic backgrounds. Although the process began with conventional educational ideas, the ESD practice framework evolved to include more interactive activities. The overall goal is to pursue discussions of a plan for the sustainable use of Tokyo Bay in the coastal communities through a university–community partnership by developing Edomae ESD leaders in the coastal community. 相似文献
45.
Takashi Tomiyasu Akito Matsuyama Ryusuke Imura Hitoshi Kodamatani Junko Miyamoto Yuriko Kono David Kocman Jo?e Kotnik Vesna Fajon Milena Horvat 《Environmental Earth Sciences》2012,65(4):1309-1322
Although the mining activity of the Idrija mine in Slovenia ceased in 1995, a large amount of mining dregs containing high
concentrations of mercury remains in the area. The mining dregs were transported with river flow and deposition along the
Idrija River. To estimate the dispersion and change in the chemical form of mercury, a total of 28 soil core samples were
taken around the river. The individual core samples were separated into layers for the analysis of their chemical composition,
carbon contents, total mercury (T-Hg) and methylmercury (MeHg) concentrations. The chemical composition measured by X-ray
fluorescence spectrometry was useful to estimate the dispersion of tailings: the fluvial terrace soil had a chemical composition
similar to that of the tailings and could be distinguished clearly from the forest soil. The highest T-Hg concentration, 1,100 mg kg−1, was observed in the fluvial terrace soil near the mine. Although the concentration decreased gradually along with distance
from the mine, concentrations higher than 200 mg kg−1 of T-Hg were still observed in the fluvial terrace soil approximately 20 km downstream from the mine. In the vertical distribution
of T-Hg in the hillslope soil, a higher value was observed in the upper layers, which suggests the recent atmospheric deposition
of mercury. The concentration of MeHg was the lowest at the riverside and higher in the hillslope soil, which was the opposite
of the T-Hg distribution. The total organic carbon content tracked similarly with the distribution of MeHg and a linear relation
with a significantly high correlation coefficient was obtained. The distinction may be related to the different dispersion
process of mercury, and the organic carbon contents may be an important factor for MeHg formation. 相似文献
46.
Salinity in Soils and Tsunami Deposits in Areas Affected by the 2010 Chile and 2011 Japan Tsunamis 总被引:1,自引:0,他引:1
Takumi Yoshii Masahiro Imamura Masafumi Matsuyama Syunichi Koshimura Masashi Matsuoka Erick Mas Cesar Jimenez 《Pure and Applied Geophysics》2013,170(6-8):1047-1066
The accumulation of data sets of past tsunamis is the most basic but reliable way to prepare for future tsunamis because the frequency of tsunami occurrence and their magnitude can be estimated by historical records of tsunamis. Investigation of tsunami deposits preserved in geological layers is an effective measure to understand ancient tsunamis that occurred before historical records began. However, the areas containing tsunami deposits can be narrower than the area of tsunami inundation, thus resulting in underestimation of the magnitude of past tsunamis. A field survey was conducted after the 2010 Chile tsunami and 2011 Japan tsunami to investigate the chemical properties of the tsunami-inundated soil to examine the applicability of tsunami inundation surveys considering water-soluble salts in soil. The soil and tsunami deposits collected in the tsunami-inundated areas are rich in water-soluble ions (Na+, Mg2+, Cl?, Br? and SO 4 2? ) compared with the samples collected in the non-inundated areas. The analytical result that the ratios of Na+, Mg2+, Br? and SO 4 2? to Cl? are nearly the same in the tsunami deposits and in the tsunami-inundated soil suggests that the deposition of these ions resulting from the tsunami inundation does not depend on whether or not tsunami deposits exist. Discriminant analysis of the tsunami-inundated areas using the ion contents shows the high applicability of these ions to the detection of tsunami inundation during periods when the amount of rainfall is limited. To examine the applicability of this method to palaeotsunamis, the continuous monitoring of water-soluble ions in tsunami-inundated soil is needed as a future study. 相似文献
47.
48.
49.
A coastal acoustic tomography experiment in the Tokyo Bay 总被引:1,自引:0,他引:1
KANEKO Arat YAMAGUCHI Keisuke YAMAMOTO Tokuo GOHDA Noriaki ZHENG Hong SYAMSUDIN Fadli LIN Ju NGUYEN Hong-Quang MATSUYAMA Masaji HACHIYA Hiroyuki HASHIMOTO Noriaki 《海洋学报(英文版)》2005,24(1):86-94
Eight sets of coastal acoustic tomography (CAT) systems were deployed during November 29 to December 10, 2002 at the coasts on both sides of Tokyo Bay to measure tidal current structures at 15-rain interval.Sound transmission across the Tokyo Bay (between Yokohama and Chiba)was successfillly traced,even under severe interference from ship generated wakes and bubbles.Tidal current fields changing from northward to southward flow are well reconstructed by the inverse analysis of travel-time difference data for a period with the best sound transmission condition. It is suggested that the CAT is the most powerful tool to continuously map tidal current fields in the coastal seas with heavy shipping traffic and fisheries activity. 相似文献
50.
A numerical experiment using a three dimensional level model was performed to clarify the mechanism generating a strong coastal
current, Kyucho, induced by the passage of Typhoon 0406 around the tip of the Tango Peninsula, Japan in June 2004. Wind stress accompanied
by Typhoon 0406 was applied to the model ocean with realistic bottom topography and stratification condition. The model well
reproduced the characteristics of Kyucho observed by Kumaki et al. (2005), i.e., the strong alongshore current with maximum velocity of 53 cm s−1 and its propagation along the peninsula with propagation speed of about 0.6 m s−1 one half-day after the typhoon’s passage. Coastal-trapped waves (CTW) accompanied by downwelling were induced along the northwest
coast of the peninsula by the alongshore wind stress. The energy density flux due to the CTW flowed eastward along the coast,
and indicated scattering of the CTW around the eastern coast of the peninsula. In addition, significant near-inertial internal
gravity waves were also caused in the offshore region from the west of the Noto Peninsula to the north of the Tango Peninsula
by the typhoon’s passage. The energy flux density of the near-inertial fluctuations flowed southward off the Fukui coast,
and part of the energy flux was trapped on the tip of the Tango Peninsula, flowing with the coast on its right. It was found
that the strong current, Kyucho, at the northeastern tip of the Tango Peninsula was generated by superposition of the near-inertial internal gravity waves
and subinertial CTW. 相似文献